1 - AS 2412-1980 INFORMATION INTERCHANGE ON 3.81 mm (0.150 in) MAGNETIC TAPE CASSETTE AT 4 CPMM (100 CPI), PHASE ENCODED AT 63 ft
4 - PREFACE
6 - 1 SCOPE AND FIELD OF APPLICATION
6 - 2 DEFINITIONS
6 - 2.1 magnetic tape:
6 - 2.2 reference tape cassette:
6 - 2.3 secondary reference tape cassette:
6 - 2.4 reference field:
6 - 2.5 test recording current:
6 - 2.6 signal amplitude reference tape cassette:
6 - 2.7 standard reference amplitude:
6 - 2.8 average signal amplitude:
6 - 2.9 in contact:
6 - 2.10 track:
6 - 2.11 bit density:
6 - 2.12 position of flux transitions:
6 - 2.13 leader:
7 - 2.14 erasing field:
7 - 2.15 print through:
7 - 2.16 reference alignment cassette
7 - 2.17 typical field:
7 - 3 ENVIRONMENT AND TRANSPORTATION
7 - 3.1 Testing environment
7 - 3.2 Operating environment
7 - 3.3 Transportation and storage environment
7 - 3.4 Transportation
7 - 4 CHARACTERISTICS OF TAPE
7 - 4.1 Mechanical properties
8 - 4.2 Tests of magnetic properties
9 - 4.3 Electrical surface resistance
9 - 5 TAPE CASSETTE
9 - 5.1 Identification of cassette sides
9 - 5.2 Mechanical characteristics
9 - 5.3 Basic specifications
10 - 5.4 Labelling of tape cassette
11 - 5.5 Magnetic properties of the cassette housing
11 - 6 RECORDING
11 - 6.1 Method of recording
11 - 6.2 Equipment
11 - 6.3 Density of recording
11 - 6.4 Flux transition spacing
11 - 6.5 Signal amplitude
11 - 6.6 Number of elongated gaps
12 - 6.7 Alignment error
12 - 6.8 Tape winding torque
12 - 6.9 Residuals of previous recordings
12 - 7 FORMAT
12 - 7.1 Number of tracks
12 - 7.2 Track dimensions
12 - 7.3 Track designation
12 - 7.4 Use of tracks
12 - 7.5 Location of characters on the tracks
12 - 7.6 Sequence of recording
12 - 7.7 Code
12 - 7.8 Sequence of characters
12 - 7.9 Data block
13 - 7.10 Control block
13 - 7.11 Gaps
13 - 7.12 Preamble and postamble
13 - 7.13 Cyclic redundancy check (CRC)
24 - ANNEX A - LAYER-TO-LAYER ADHESION
25 - ANNEX B - MEASUREMENTOF LIGHT TRANSMITTANCE
25 - B.1 INTRODUCTION
25 - B.2 DESCRIPTION OF THE TEST DEVICE
25 - B.2.1 Radiation (light) source
25 - B.2.2 Optical path
25 - B.2.3 Measuring mask geometry
25 - B.2.4 Photoelectric cell
25 - B.2.5 Measuring equipment
26 - B.3 TEST PROCEDURE
26 - B.4 GUIDANCE ON CONSTRUCTION